CVE-2024-31143 double unlock in x86 guest IRQ handling

2024-07-1813:31:31

XEN

github.com

cve-2024-31143

x86 guest

irq handling

pci msi

multiple message

error path

lock release

AI Score

6.5

Confidence

Low

SSVC

Exploitation

none

Automatable

Technical Impact

total

JSON

An optional feature of PCI MSI called “Multiple Message” allows a
device to use multiple consecutive interrupt vectors. Unlike for MSI-X,
the setting up of these consecutive vectors needs to happen all in one
go. In this handling an error path could be taken in different
situations, with or without a particular lock held. This error path
wrongly releases the lock even when it is not currently held.

ADP Affected

[
  {
    "cpes": [
      "cpe:2.3:o:xen:xen:*:*:*:*:*:*:*:*"
    ],
    "vendor": "xen",
    "product": "xen",
    "versions": [
      {
        "status": "affected",
        "version": "4.4",
        "lessThan": "4.16",
        "versionType": "custom"
      }
    ],
    "defaultStatus": "unknown"
  }
]